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DIGITAL.CSIC
Article . 2012 . Peer-reviewed
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Propuesta de utilización de ensayos de procedencias de "Pseudotsuga menziesii" (Mirb) Franco como material de base para la obtención de material forestal de reproducción

Authors: Merlo, E.; Díaz, Raquel; Fernández López, Josefa; Zas Arregui, Rafael;

Propuesta de utilización de ensayos de procedencias de "Pseudotsuga menziesii" (Mirb) Franco como material de base para la obtención de material forestal de reproducción

Abstract

[ES] Se propone la utilización de ensayos de procedencias de Pseudotsuga menziesii como material de base para la producción de semilla, tras la selección de los mejores fenotipos. El estudio se desarrolló sobre ocho ensayos de procedencias localizados en el Norte de España, utilizando los datos de crecimiento a los 16-18 años de edad. Se realizó un análisis de varianza individualizado en cada parcela y se calculó la descomposición de la varianza fenotípica. Se estimó el potencial de ganancia por selección de procedencias y las heredabilidades entre y dentro de procedencias. Además en cada parcela se analizó la diferenciación entre procedencias y la variabilidad genética dentro de ellas. Se calcula la ganancia esperada para tres escenarios distintos de selección: a) dentro de procedencias, b) entre y dentro de procedencias y c) selección masal. En algunas parcelas se consigue más de un 20% de ganancia seleccionando entre y dentro de procedencias, duplicando a los otros escenarios de selección. Los parámetros analizados, junto con la ganancia esperada, el estado actual de supervivencia en cada parcela y la calidad de estación afectarán al método de actuación propuesto en cada caso. De los 8 ensayos analizados, 7 de ellos se proponen como material de base y uno como parcela de conservación. En 5 se proponen claras selectivas ajustadas al método de selección elegido y en las otras 3 claras sistemáticas para mantener el diseño y continuar las mediciones de crecimiento.

[EN] In this paper we discuss the possibility of using the Pseudotsuga menziesii provenance tests after selecting the best phenotypes as local seed sources. The study was conducted on eight provenance tests located in northern Spain using 16-18 yr-old growth data. A variance analysis was used to decompose the phenotypic variance at each site. The potential gain through provenance selection and the heritabilities within and among provenances were estimated. The differentiation among provenances and the genetic variability within them were also analyzed. Predicted gain was estimated for three different selection methods: a) within provenance selection, b) within and among provenance selection and c) mass selection. For some sites, predicted gain was over 20% using option b) and doubled that of the other selection methods. The proposed selection method for each site varied in relation to the estimated gains, the actual survival and the site quality. Seven out of the eight studied tests are proposed as base material for seed production, whereas the remainder one is proposed as a gene conservation site. Selective thinning is proposed in five sites while systematic thinning is recommended in the other three sites in order to maintain the experimental design to enable further measurements.

Peer reviewed

Country
Spain
Related Organizations
Keywords

Local seed source, Ganancia por selección, Genetic gain, Variación entre y dentro de procedencias, Masas productoras de semilla, Pseudotsuga menziesii, Within and among provenances variability

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green